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Key to Chaerophyllum

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1 Umbellets (4-) 6-20 per umbel; biennials, 3-20 dm tall.
  2 Umbellets 15-29 per umbel
  2 Umbellets 6-12 per umbel
1 Umbellets 1-3 (-5) per umbel; annuals, 2-9 dm tall.
    3 Schizocarp beaks 0.2-0.9 (-1.1) mm long; larger umbellets 3-7-flowered; longest fruiting pedicels (6-) 7-16 mm long.
      4 Longest schizocarps 7-10 mm long, 3-5× as long as wide; schizocarps glabrous; longest hairs on rays and upper stem 0.6-1.2 mm long (hairs may be sparse)
      4 Longest schizocarps 5-7 mm long, 2-3× as long as wide; schizocarps glabrous or pubescent; longest hairs on rays and upper stem 0.1-0.4 (-0.8) mm long, or hairs absent
    3 Schizocarp beaks (0.6-) 0.8-1.6 mm long; larger umbellets (4-) 6-13-flowered; longest fruiting pedicels 3-10 (-13 mm long.
        5 Leaves with ultimate lobes oblong or lanceolate, (0.5-) 0.8-2.3 mm wide, 1-4× as long as wide; larger umbellets (4-) 6-9 (-10)-flowered; bractlets cilate; schizocarps glabrous or pubescent
        5 Leaves with ultimate lobes linear, 0.4-1.1 mm wide, 4-10× as long as wide; larger umbellets 9-13-flowered; bractlets ecilate, though simetimes very finely serrulate; schizocarps glabrous